One thing I do is:
pulling straight forward to line up, at the very end, still moving forward, I will turn the truck (cock it a little)a 5er is slow to re-act in the beginning. if your truck is already turned it re-acts quicker. When you back up and turn, the 5er will go straight for a few feet before it re-acts. this just helps it re-act quicker when backing.
Don't feel bad if you have to take 2-3 stabs at it in the beginning. We all did